Hye Jung (you) and Hye Jin, twins created by scientist Kim Won Shik out of the cells donated from human beings.  They are experiment 2G-B, advanced species equipped with extraordinary powers.  Of course, no part of them is robotic or mechanic. They are formed from the remains of others, developing in labs and carefully monitored, raised in families, and taught to have the knowledge when the time is right.

There is also experiment 4G-B, 5 young men who were forged to protect the twin "daughters" of Kim Won Shik.  N, Leo, Ken, Bin, and Hyuk are born. 2G-B and 4G-B do not know they are experiments. They don't understand why they possess elements that ordinary people do not have. They are raised with the training of their powers in secrecy, believing they are descendants from beings of another world, showing up on the doorstep of Kim Won Shik and his partner one fateful day.

What will become of you, when Hye Jin is kidnapped because her powers were discovered?

What will become of the one you call brother, who begins to fall in love with you?

What will become of your heart, that could possibly have a soul?

What can the remains of a human being do?